In the month following the signing of the treaty, the Weimar constituent assembly completed a draft constitution for the new republic, resulting in what was hailed as the most modern democratic constitution of its day. The Weimar constitution provided for a popularly elected president who was given considerable power over foreign policy and the armed forces. Article 48 also gave the president emergency decree powers to protect the republic from crises initiated by its opponents on either the left or the right. The president was empowered to nominate the chancellor, whose government required the confidence of the lower house of the parliament, the Reichstag, which was elected by universal suffrage through a system of proportional representation. An upper house, the Reichsrat, comprised delegates appointed by the governments of the federal states, the Länder.
The Weimar constitution's most modern features, the provisions for popular referendum and initiative, were designed to enable the electorate, by way of petition, to introduce bills into the Reichstag and to force the body to vote on them. If the bill was voted down, the constitution prescribed a national referendum to allow the electorate to pass the bill into law against the wishes of the Reichstag. Through these provisions, it was thought, the government would never be allowed to ignore the wishes of the voters.
The Weimar constitution was promulgated formally on August 11, 1919, ending the provisional status of government in Germany that had begun with Scheidemann's proclamation of a republic the previous November. In September the government, judging the situation sufficiently safe in Berlin, returned to the capital. But it did not yet consider it sufficiently safe to risk nationwide elections for president or for a Reichstag to replace the constituent assembly. Instead the assembly prolonged Ebert's provisional term as president for three years; elections for the Reichstag were delayed until June 1920.